Does your skin really have too reach a below freezing temperature in order to get frostbite?

JackFrostNippin'Away. Well that's the common idea but actually it doesn't have to freeze, just get cold enough for long enough that the blood vessels constrict and shut down oxygen to the skin cells, which then get even colder and then probably freeze and if not that get pretty darned dysfunctional.The first part is usually called "frost nip" which can then quickly turn into frost bite,often if it's so cold you're numb.